Almath Crucibles offer a variety of sapphire tubes.
Sapphire tubes are ideal for protecting high-temperature thermocouples in corrosive environments, are 100% gas tight and will operate up to 2000C.
- These tubes are not always held in stock – please check current delivery times with us if this is critical.
- Different diameters and lengths are available on request. Please ask.
- We can also offer custom-made sapphire products. Please request a quotation.
| Markets & Applications | |
|---|---|
| Semiconductor Manufacturing | Substrates, Wafers, Plasma Containment Tubes, Chamber Viewports, Lift Pins, Gas Injectors |
| Optical | Laser applications; high-performance optical windows including UV, NIR, IR; NMR Spectroscopy; windows, lenses, prisms, blanks |
| Military/Aerospace | Forward Looking Infrared (FLIR) windows, guidance systems, radiometry, missile nose domes, other general aerospace and marine applications |
| Industrial | Gas and chemical analysis, thermocouples, insulators for RF and microwave applications, medical instrumentation and implants, wear parts including rods, bearings, blanks, friction plates |
- Chemical Resistance
- Acids – Concentrated
- Acids – dilute
- Alkalis
- Halogens
- Metals
- Electrical Properties
- Dielectric constant
- Dielectric strength (kV mm-1)
- Volume resistivity @25 ̊C (Ohm-cm)
- Mechanical Properties
- Compressive strength (MPa)
- Hardness – Knoop (kgf mm-2)
- Hardness – Vickers (kgf mm-2)
- Tensile modulus (GPa)
- Physical Properties
- Apparent porosity (%)
- Density (g cm-3)
- Refractive index
- Useful optical transmission range (nm)
- Water absorption – saturation (%)
- Thermal Properties
- Coefficient of thermal expansion @20-1000 ̊C (x10-6 K-1 )
- Melting point ( ̊C)
- Specific heat @25 ̊C ( J K-1 kg-1 )
- Thermal conductivity @20 ̊C (W m-1 K-1 )
- Upper continuous use temperature ( ̊C)
- –
- Good
- Good
- Good
- Good
- Good
- –
- 7.5-11.5
- 15-50
- >10(14)
- –
- 2100
- 2000
- 1600-1800
- 350-390
- –
- 0
- 3.985
- 1.71-1.79
- 150-5500
- 0
- –
- 5.8
- 2050
- 750
- 35-40
- 1800-1950
ALMATH
Almath are a globally recognised producer and distributor of high purity crucibles and refractory products.
Company registration no: 3167902 (Incorporated 1996).
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